The patch titled
bounce: call flush_dcache_page() after bounce_copy_vec()
has been added to the -mm tree. Its filename is
bounce-call-flush_dcache_page-after-bounce_copy_vec.patch
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------------------------------------------------------
Subject: bounce: call flush_dcache_page() after bounce_copy_vec()
From: Gary King <gking@xxxxxxxxxx>
I have been seeing problems on Tegra 2 (ARMv7 SMP) systems with HIGHMEM
enabled on 2.6.35 (plus some patches targetted at 2.6.36 to perform cache
maintenance lazily), and the root cause appears to be that the mm bouncing
code is calling flush_dcache_page before it copies the bounce buffer into
the bio.
The bounced page needs to be flushed after data is copied into it, to
ensure that architecture implementations can synchronize instruction and
data caches if necessary.
Signed-off-by: Gary King <gking@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/bounce.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/bounce.c~bounce-call-flush_dcache_page-after-bounce_copy_vec mm/bounce.c
--- a/mm/bounce.c~bounce-call-flush_dcache_page-after-bounce_copy_vec
+++ a/mm/bounce.c
@@ -116,8 +116,8 @@ static void copy_to_high_bio_irq(struct
*/
vfrom = page_address(fromvec->bv_page) + tovec->bv_offset;
- flush_dcache_page(tovec->bv_page);
bounce_copy_vec(tovec, vfrom);
+ flush_dcache_page(tovec->bv_page);
}
}
_
Patches currently in -mm which might be from gking@xxxxxxxxxx are
linux-next.patch
bounce-call-flush_dcache_page-after-bounce_copy_vec.patch
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